CN108418381B

CN108418381B - Linear vibration motor

Info

Publication number: CN108418381B
Application number: CN201810102023.1A
Authority: CN
Inventors: 浦晓峰; 凌芳华; 柴之麟; 陶锋
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2018-02-01
Filing date: 2018-02-01
Publication date: 2021-02-09
Anticipated expiration: 2038-02-01
Also published as: CN108418381A

Abstract

The invention provides a linear vibration motor which comprises a shell with an accommodating space, a coil fixed on the shell, a vibration unit arranged opposite to the coil at an interval, and an elastic body for supporting the vibration unit and suspending the vibration unit in the accommodating space, wherein the elastic body comprises an elastic part and a damping material layer superposed on the elastic part, the damping material layer comprises at least two layers, the elastic part is clamped between the two damping material layers, and the elastic part and the damping material layer are in an integrally formed structure. Compared with the related art, the linear vibration motor has the advantages of simple assembly procedure, good vibration performance and high response speed.

Description

Linear vibration motor

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of motors, in particular to a linear vibration motor applied to portable electronic products.

[ background of the invention ]

With the development of electronic technology, portable consumer electronic products, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices, are more and more sought after by people, and these electronic products generally use linear vibration motors to perform system feedback, such as incoming call prompt, information prompt, navigation prompt, vibration feedback of game consoles, and the like. In such a wide application, the performance of the linear vibration motor is more and more required.

The linear vibration motor of the related art includes a housing having an accommodating space, a vibration unit accommodated in the accommodating space, an elastic member that supports and suspends the vibration unit in the accommodating space, a damping member, and a coil fixed to the housing.

However, in the related art linear vibration motor, the damping member needs to be separately assembled as a separate part during the assembly process, thereby increasing the assembly process of the linear vibration motor and increasing the production cost. Also, the elastic body of the linear vibration motor in the related art has a single structure, and its damping characteristic is not good.

Therefore, there is a need to provide a new linear vibration motor to solve the above technical problems.

[ summary of the invention ]

The invention aims to provide a linear vibration motor with good vibration performance and high response speed.

In order to achieve the above object, the present invention provides a linear vibration motor, including a housing having an accommodation space, a coil fixed to the housing, a vibration unit disposed opposite to the coil at an interval, and an elastic body supporting the vibration unit and suspending the vibration unit in the accommodation space, wherein the elastic body includes an elastic member and a damping material layer overlapped on the elastic member, the damping material layer includes at least two layers, the elastic member is sandwiched between the two damping material layers, and the elastic member and the damping material layer are integrally formed.

Preferably, the elastic member comprises at least two elastic members which are mutually overlapped and attached.

Preferably, two layers of the damping material completely cover opposite sides of the elastic member, respectively.

Preferably, the elastic body comprises a fixed arm fixed on the shell, an elastic arm bent and extended in a direction close to the vibration unit and suspended in the air, and a connecting arm bent and extended by the elastic arm, and the connecting arm is fixedly connected to the vibration unit.

Preferably, the fixed arm and the connecting arm are distributed on two opposite sides of the vibration unit.

Preferably, the elastic bodies include two elastic bodies respectively located at two opposite sides of the vibration unit, and the two elastic bodies are in a central symmetry structure with respect to the vibration unit.

Preferably, the housing includes an upper cover, a lower cover, and a sidewall extending from the upper cover to the lower cover in a bending manner, the coil is fixed to the lower cover or the upper cover, and the fixing arm of the elastic body is fixed to the sidewall.

Preferably, the damping material layer is fixed to the elastic member in a fitting manner, a composite manner or an electroplating manner.

Compared with the prior art, the damping material layers are arranged on the surfaces of the two sides of the elastic body to form an integral structure, and the elastic body and the damping material layers can be assembled simultaneously only by one-time assembly in the assembly process, so that the assembly procedure is saved, and the production cost is reduced; meanwhile, under the condition that the rigidity of the linear vibration motor is not changed, the damping material layer can be arranged to improve the damping characteristic of the elastic body, so that the quality factor of the linear vibration motor is improved, and the response speed of a product is improved.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is an exploded view of a partial perspective structure of a linear vibration motor according to the present invention;

fig. 2 is a schematic structural view of an elastic body of the linear vibration motor of the present invention;

3 fig. 33 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 in 3 fig. 32 3. 3

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is an exploded view of a partial three-dimensional structure of a linear vibration motor according to the present invention. The invention provides a linear vibration motor 100, which comprises a shell 1 with an accommodating space 10, a vibration unit 2 accommodated in the accommodating space 10, an elastic body 3 for supporting the vibration unit 2 to be suspended in the accommodating space 10, and a coil 4 arranged corresponding to the vibration unit 2.

The housing 1 includes an upper cover 11, a lower cover 12, and a sidewall 13 formed by bending and extending the lower cover 12 toward the upper cover 11, and the coil 4 is accommodated in the accommodating space 10 and fixed to the upper cover 11 or the lower cover 12, in this embodiment, the coil is fixed to the upper cover 11.

Fig. 2 is a schematic structural diagram of an elastic body of a linear vibration motor according to the present invention. In the present embodiment, the elastic body 3 has a U-shaped structure, and includes an elastic arm 31, a fixing arm 32 bent and extended from one end of the elastic arm 31 and fixed to the housing 1, and a connecting arm 33 bent and extended from the other end of the elastic arm 31 and fixed to the vibration unit 2. Specifically, the fixed arm 32 and the connecting arm 33 are bent in the same direction and are respectively located at two opposite sides of the vibration unit 2.

The elastic arm 31 is suspended in the accommodating space 10.

The fixing arm 32 is fixed to the side wall 13 of the housing 1, and the connecting arm 33 is fixed to the side of the vibrating unit 2 away from the fixing arm 32.

Of course, the elastic body 3 is not limited to the U-shaped structure, and may have other shapes such as a ring shape.

In this embodiment, the elastic bodies 3 include two elastic bodies 3 respectively located at two opposite sides of the vibration unit 2, and the two elastic bodies 3 are in a central symmetrical structure with respect to the vibration unit 2. Specifically, the connecting arms 33 of the two elastic bodies 3 are respectively fixed on two opposite sides of the vibration unit 2 and located at two diagonal positions of the vibration unit 2.

The coil 4 is arranged corresponding to the vibration unit 2, specifically, the coil 4 is arranged opposite to the vibration unit 2, but not limited thereto, and the coil 4 may be arranged according to a specific structure of the vibration unit 2 to ensure that the stress of the vibration unit 2 is balanced.

3 Please 3 refer 3 to 3 FIG. 33 3, 3 which 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 32 3. 3 The elastic body 3 includes an elastic member 311 and damping material layers 312 stacked on two opposite sides of the elastic member 311, in this embodiment, the damping material layers 312 include two layers, and the two layers of the damping material layers 312 respectively cover two opposite sides of the elastic member 311. Of course, in practical applications, the damping material layer 312 may also be a plurality of layers.

The damping material layer 312 may be stacked on the surface of the elastic member 311 by a process such as bonding, compounding, electroplating, coating, and pressing, and is not limited to the above process.

In a specific implementation, the elastic body 3 comprises one or at least two elastic members 311, and when the elastic body 3 comprises one elastic member 311, the outer surfaces of two damping material layers 312 respectively positioned at two opposite sides of one elastic member 311 form a package, so as to form the elastic body 3 of an integrated structure; when the elastic body 3 includes at least two elastic members 311, the elastic members 311 are stacked and bonded into a whole, and at this time, the two damping material layers 312 are respectively located on the outer surfaces of two opposite sides of the structure where the elastic members 311 are bonded into a whole to form a package. Thus, the elastic members 311 and the two damping material layers 312 form an integrated structure, and the integrated assembly can be realized.

The elastic member 311 has rigidity and elasticity, and the elastic member 311 is made of a metal material, but not limited thereto, and may be made of other composite materials.

Under the condition that the elastic body 3 keeps the rigidity unchanged, the damping material layer 312 is arranged to effectively increase the damping coefficient of the linear vibration motor 100, so as to improve the quality factor of the linear vibration motor 100 and improve the response speed of the linear vibration motor 100.

In the assembly process of the linear vibration motor 100, the damping material layer 312 and the elastic member 311 are fixedly stacked, and the damping material layer 312 and the elastic member 311 can be integrally assembled without respectively assembling the damping material layer 312 and the elastic member 311, so that the assembly procedure is simplified, and the effect of reducing the production cost can be achieved.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a linear vibration motor, including the casing that has accommodating space, be fixed in the coil of casing, with the vibration unit that the coil relative interval set up and will the vibration unit supports and suspends in accommodating space's elastomer, its characterized in that, the elastomer include the elastic component and coincide in the damping material layer of elastic component, the damping material layer includes at least two-layer, the elastic component presss from both sides and locates two-layerly between the damping material layer, two-layerly the damping material layer covers respectively completely the relative both sides of elastic component, the elastic component with the damping material layer is the integrated into one piece structure.

2. The linear vibration motor of claim 1, wherein the elastic member includes at least two and is attached to each other in a stacked manner.

3. The linear vibration motor according to claim 1, wherein the elastic body comprises a fixed arm fixed to the housing, an elastic arm bent and extended from the fixed arm in a direction close to the vibration unit and suspended in the air, and a connection arm bent and extended from the elastic arm, and the connection arm is fixedly connected to the vibration unit.

4. The linear vibration motor of claim 3, wherein said fixed arm and said connecting arm are distributed on opposite sides of said vibration unit.

5. The linear vibration motor of claim 4, wherein the elastic bodies include two elastic bodies respectively located at opposite sides of the vibration unit, and the two elastic bodies have a central symmetrical structure with respect to the vibration unit.

6. The linear vibration motor according to claim 3, wherein said housing includes an upper cover, a lower cover, and a side wall extending from said upper cover to said lower cover, said coil is fixed to said lower cover or said upper cover, and said fixing arm of said elastic body is fixed to said side wall.

7. The linear vibration motor of claim 1, wherein the damping material layer is fixed to the elastic member by a bonding method, a composite method, or a plating method.